Overhead line conductors can generate audible noise across a wide frequency spectrum as a result of elevated electric fields at the conductor surface. Such fields are enhanced by the presence of surface defects, insects, water drops and pollution. Within this paper, the impact of a superhydrophobic coating on the audible noise produced by an overhead line conductor is examined. Noise levels from a conductor coated with a superhydrophobic coating were compared to those from a bare conductor in a semi-anechoic chamber. The conductors were energised at voltages to provide surface electric fields ranging from 6 kV/cm to 21 kV/cm (rms). With a continuous water spray system depositing droplets on the conductor surface, the frequency domain sound pressure level, overall sound pressure levels and corona discharge magnitude were measured. It is demonstrated that the use of a superhydrophobic coating reduced audible noise levels and corona discharge magnitude, especially at electric fields above 14 kV/cm. The image analysis suggests that the water drop size distribution and the position of surface droplets on the conductor circumference play an important role in the magnitude of audible noise.

中文翻译：

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超疏水表面在降低 HVAC 架空线导体可听噪声方面的潜力的实验验证

由于导体表面的电场升高，架空线路导体会在很宽的频谱范围内产生可听噪声。表面缺陷、昆虫、水滴和污染的存在增强了这些领域。在本文中，研究了超疏水涂层对架空线导体产生的可听噪声的影响。将涂有超疏水涂层的导体的噪声水平与半消声室中裸导体的噪声水平进行了比较。导体在电压下通电以提供范围从 6 kV/cm 到 21 kV/cm (rms) 的表面电场。通过在导体表面沉积液滴的连续喷水系统，测量了频域声压级、总声压级和电晕放电幅度。结果表明，使用超疏水涂层可降低可听噪声水平和电晕放电幅度，尤其是在 14 kV/cm 以上的电场下。图像分析表明，水滴尺寸分布和表面水滴在导体圆周上的位置对可听噪声的大小起着重要作用。